All-in-One Online Tools for Everyone
Fast, secure, and easy-to-use online utilities for your daily tasks. Convert files, calculate math, estimate construction materials, and generate text — 100% in your browser!
Browse Categories
Find the perfect tool organized by task and discipline
Unit Converters
Exact metric & imperial conversions for weight, length, temperature & volume.
Math & Education
Percentage changes, fractions, square roots, geometry & statistics.
Date & Time
Calendar arithmetic, business day intervals, stopwatch & multi-counter.
Home & Construction
Paint coverage, pool volume, topsoil, roof pitch, square footage & materials.
Finance
Discount savings, markup, profit margins, CD returns & overtime pay.
Text & Developer Tools
Case converter, sentence analytics, tiny text, numbers to words & color codes.
Generators
Dice roller, animals, pictionary words, teams, countries & fantasy names.
Health & Fitness
Daily hydration intake, 1RM lifting benchmarks & steps to miles.
Image Tools
Convert HEIC, AVIF, and SVG to PNG or JPG 100% in your browser.
Audio & Video
Extract MP3 audio, convert WAV to MP3, and MOV to MP4 locally.
PDF Tools
Merge images into PDF, convert PDF pages to PNG, and HTML export.
Device & Browser Tests
Typing speed, CPS, webcam, microphone, keyboard, mouse & display diagnostics.
Popular Tools
Most used and trusted tools by our community
Kg to Lbs Converter – Kilograms to Pounds
Convert kilograms to pounds with the international avoirdupois standard factor of 2.2046226218 lbs per kg.
Percentage Increase Calculator – Percent Growth
Calculate percentage growth, percent reduction, absolute change, and multiplication factor between initial and final values.
Date Calculator – Add or Subtract Calendar Days
Add or subtract days, weeks, months, and years from any starting date with precise calendar and leap year adjustments.
Dice Roller – Roll Virtual D4 to D100 Dice
Roll virtual polyhedral dice (d4 through d100) with honest cryptographic randomness and custom modifiers.
GCF Calculator
Compute the greatest common factor (GCF/HCF/GCD) of any group of numbers with step-by-step methods.
MP4 to MP3 Converter
Extract crisp MP3 audio tracks from MP4 video files with custom bitrate selection.
Roman Numeral Converter
Convert Arabic integers to Roman numerals (I, V, X, L, C, D, M) and Roman numerals to integers with detailed steps.
HEIC to PNG Converter
Convert Apple iPhone HEIC photos to high-resolution PNG images safely in your browser.
Square Footage Calculator
Calculate square footage for rectangular, circular, or triangular spaces with waste percentage and material cost.
Case Converter – UPPER, lower, camelCase, Title
Transform text casing into UPPER, lower, Title Case, Sentence case, camelCase, snake_case, and kebab-case instantly.
Stopwatch – Online Millisecond Accurate Stopwatch
Accurate online stopwatch with millisecond precision, lap tracking, split times, and background tab accuracy.
CD Calculator
Calculate interest earned, ending balance, and annual percentage yield (APY) on Certificate of Deposit accounts.
Featured Suites
Handpicked collections of our most capable in-browser tools
Online Calculators
Math made easy! GCF, LCM, proportions, quadratic roots & standard deviation with step-by-step working.
PDF Tools
Work with PDFs directly in your browser. Convert images to PDF, extract PNGs, and generate from HTML.
Image Converters
Convert Apple HEIC photos, modern AVIF files, and SVG vectors into standard PNG or JPG files locally.
Smart Generators
Interactive generators for decision making, fantasy storytelling names, holiday secret santa, and text.
Why Choose Our Tools?
Designed from the ground up for speed, privacy, and maximum accuracy.
Lightning Fast
Calculations and conversions run natively in your browser using modern Web APIs.
100% Free
No subscriptions, no hidden limits, and no credit card required. Free forever.
Secure & Private
Your files and values never leave your device. Zero server uploads.
No Installation
Works seamlessly on desktop, tablet, and mobile browsers without any downloads.
Why In-Browser Computing Matters for Privacy & Speed
Traditional online utility websites function by uploading your files, numbers, and personal notes to remote cloud servers. This legacy architecture creates major privacy vulnerabilities, risks data breaches, and forces you to wait in server queues.
The Problem with Cloud Converters
Remote converter services store your files on external disks, log IP addresses, and often monetize your private data for advertising profiles.
The Toolzy Client-Side Sandbox
Toolzy processes everything in your browser memory using the HTML5 Canvas, WebAssembly, and the Web Crypto API. Your files never touch our servers.
Instant 0ms Latency
Without upload or download network bottlenecks, calculations and conversions occur instantly on your computer or phone hardware.
Frequently Asked Questions
Everything you need to know about Toolzy's privacy, technology, and free access.
Are all tools on Toolzy completely free to use?▼
Yes, every tool, calculator, converter, and generator on Toolzy is 100% free with unlimited usage. There are no paid tiers, no trial periods, and no credit card requirements.
Do I need to create an account or install browser software?▼
No. You never need to sign up, create an account, or install browser extensions. Every tool runs instantly in any modern web browser on desktop, tablet, or mobile.
Is my private data or uploaded files sent to your servers?▼
Never. Toolzy operates on a strict zero-upload architecture. Calculations, string manipulations, image transcoding, and audio extraction run 100% client-side in your local browser sandbox using HTML5 Canvas, WebAssembly, and the Web Crypto API. Your files never touch external servers.
How accurate are the mathematical and financial calculators?▼
All tools are built using validated industry and scientific standards—including NIST SP 811 unit conversion factors, IEEE 754 precision math, and standard financial compounding equations. Formulas and step-by-step solutions are clearly displayed for full verification.
Can I use Toolzy on mobile devices (iOS and Android)?▼
Yes, Toolzy is built mobile-first. Every calculator, converter, and generator is fully responsive, touch-friendly, and optimized for smooth performance on both smartphones and tablets.
Can Toolzy work offline?▼
Because our utilities execute locally via client-side JavaScript, once a tool page is loaded into your browser cache, you can continue performing calculations and conversions even if your internet connection drops.